Ooops. We can't be having a bug like that.
A hotfix has already been deployed and is ready for download.
There was a previous bug that could allow the landing pad to descend out of the main ship and sit in empty space. The fix for that introduced this new bug. It's fixed now and the repair lasers work in build 0.501.
Thanks for letting me know so quickly. It would have been a shame to have a game-breaking bug like that at the start of the weekend.